Circuit device and power converter

Patent metadata

Field	Value
Publication number	US-11049640-B2
Application number	US-201716069375-A
Country	US
Kind code	B2
Filing date	Jan 4, 2017
Priority date	Jan 21, 2016
Publication date	Jun 29, 2021
Grant date	Jun 29, 2021

Abstract

A circuit device and a power converter include a core, a coil surrounding at least a part of the core, and a first heat transfer member being in surface contact with the core. A temperature rise of the core can thus be prevented or reduced.

First claim

The invention claimed is:

1. A circuit device comprising:
a core having a top portion, a bottom portion opposite to the top portion, and a lateral portion between the top portion and the bottom portion;
a substrate having a first main surface and a second main surface opposite to the first main surface;
a coil disposed on the first main surface and surrounding at least a part of the core;
a first heat transfer member being in surface contact with the top portion of the core;
a first heat dissipation member being in surface contact with the bottom portion of the core and facing the second main surface; and
an elastic member pressing the first heat transfer member toward the core,
the first heat transfer member including a projecting portion thermally connected to the coil,
the first heat transfer member pressing the core toward the first heat dissipation member,
the projecting portion pressing the coil toward the first heat dissipation member.

2. The circuit device according to claim 1 , wherein the projecting portion is in surface contact with the lateral portion of the core.

3. The circuit device according to claim 1 , further comprising a second heat transfer member being in contact with the projecting portion and the coil and having electrical insulation properties.

4. The circuit device according to claim 1 , further comprising a third support strut thermally connecting the substrate to the first heat dissipation member and supporting the substrate.

5. The circuit device according to claim 4 , further comprising a third heat transfer member being in contact with the second main surface and the third support strut.

6. The circuit device according to claim 1 , further comprising:
a second coil disposed on the second main surface and surrounding at least a part of the core; and
a third support strut thermally connecting the second coil to the first heat dissipation member and supporting the substrate.

7. The circuit device according to claim 6 , further comprising a third heat transfer member being in contact with the second coil and the third support strut and having electrical insulation properties.

8. The circuit device according to claim 6 , wherein
the substrate includes a thermal via penetrating between the first main surface and the second main surface, and
the thermal via thermally connects the coil and the second coil.

9. The circuit device according to claim 1 , wherein the elastic member presses the projecting portion toward the coil.

10. The circuit device according to claim 1 , comprising a cover on the top portion of the core,
wherein the elastic member is attached to the cover.

11. The circuit device according to claim 1 , comprising a first support strut thermally and mechanically connecting the first heat transfer member to the first heat dissipation member.

12. A power converter comprising the circuit device according to claim 1 .

Assignees

• Mitsubishi Electric Corp

Inventors

• Fujii Kenta
• Nakajima Koji
• Shirakata Yuji
• Tahara Jun
• Kumagai Takashi

Classifications

• H01F27/22 Primary

  Cooling by heat conduction through solid or powdered fillings · CPC title

• H02M3/003

  Constructional details, e.g. physical layout, assembly, wiring or busbar connections · CPC title

• H02M3/33573

  Full-bridge at primary side of an isolation transformer · CPC title

• H01F27/08 Primary

  Cooling (heat-transfer elements F28F); Ventilating (structural details of casings H01F27/02) · CPC title

• H01F2027/2819

  Planar transformers with printed windings, e.g. surrounded by two cores and to be mounted on printed circuit · CPC title